Granted Bitcoin is limited, but it's a cryptocoin. Just like any of the other 500 coins out there including Paycoin which I think you believe in. There is no fundamental reason why bitcoin should have any more value then any other coin other then it was first to market.
And there is no limit to the number of crypto coins that could be made, hell, we could each have our own coin, and why should it be worth any less than bitcoin? Answer, it shouldn't, they're all worthless.
At least with a bulb I can grow a flower and give it to my wife.