By 'investors' you mean 'miners' and by 'risk' you mean 'electricity'.
Correct -- miners that have invested thousands of dollars into equipment and spent thousands more on electricity mining Megacoin (my power bill last month was just over $1500 USD...and I almost exclusively mined Megacoin last month.) Also, investors that have purchased Megacoins on the exchanges. I bought Bitcoins with US Dollars and used those Bitcoins to buy Megacoins. Both of these are pretty much the definition of investing -- whether directly or indirectly. If you wouldn't define this as risk, it's my opinion that you don't understand the definition. It's a lot lower risk to join the party late and start getting involved once success is certain (or virtually certain.)
The bottom line is that anybody that was there at the start in the altcoin world typically had an advantage. Over 21,000,000 Litecoins have already been mined and a huge chunk of those were mined when the difficulty was < 10. Maybe they weren't concentrated into as short of a period of time...but to people just getting into altcoins now what's the difference? Megacoin had a fair announcement and the Megacoins that have been mined are distributed among thousands of people. People are continuing to mine at a rate higher than ever despite the block-reward:difficulty ratio bouncing around all-time lows (obviously the value helps here.) I believe early investors deserve a lot of the credit for the success of a coin and help to build a strong community -- the people that come in later are a lot less involved. It's just like investing in a company -- the early investors typically get bigger percentages for less money...and as the company grows in size and valuation later investors get smaller percentages for their contributions. This is pretty typical and, in all honesty, just makes sense. The earlier you get involved, the more risk you are taking. It's also an advantage to have more coins to work with for creating products and services because a lot of the earlier investors are more motivated individuals.
Look at Bitcoins -- there was a time when you could mine a block of 50 Bitcoins in a few minutes with a single GPU. Now, It would take a decent-sized GPU farm weeks (or even months) to mine 50 bitcoins. Obviously there is new hardware out...but what's the difference? Even if Megacoins aren't as well distributed as Bitcoins are right now, they easily could be via trading, shops, services, etc. It's not all about mining.
Basically, I think your logic is a bit flawed here. There is a reason block rewards for most coins are reduced at set intervals -- it's economics. It's obviously important to keep people mining and keep the network stable...but the Megacoin reward reduction could be likened to most investments more accurately than Bitcoins. Not saying one is better than the other...but the only thing that's obviously is they are different.
Scam coins are coins where the dev just copies another currency, changes the name and a few values, and bails as soon as they can dump it on the exchange. Megacoin has an excellent developer who has turned out some pretty impressive work...and has some ambitious plans that I believe he will follow-through on. He hasn't let us down yet...and that's a rare find. This community is strong...and the value has steadily risen ever since the difficulty formula was adjusted.
I don't think there's a better investment out there...and I think it's the perfect coin to be added to the BTC-E family. They would attract a lot of new investors and Megacoin would simultaneously increase exposure and value overnight. I know I'd be trading back at BTC-E -- the traders there tend to be a lot more professional than at Cryptsy...and it's a lot closer to being a true exchange. They're restrictive over there...but I think it would breath some new life into things for them. Megacoin is truly the only reasonable candidate.