You can go ahead with your decision. I found your decision valid because as you already say that, Bitcoin won't give you 5x income. Actually Bitcoin is slow profit generator but it is safe. That's why people like it and still investing with Bitcoin. But altcoins doesn't have guarantee, they found with many negative issues, many accusations, what could make altcoins questable for future. That's why you need to go with potential altcoins to minimize risk. Investment with low quality altcoins are questable for future
If am to judge from him expecting 5× his invested capital, then am wrong. Investment is set once it has done 2× your capital, expecting more ROI is a matter of decision though, but as far as altcoin project are concerned you can have whatever return but there is no guarantee of it and as well it all rely on Bitcoin for her movement, let not be too optimistic about it because it might dump badly we have seen cases like that.
It should be a matter of diversifying into a potential altcoin and not expecting much return which might lead to other wrong tendencies that cloud your mind and you end up losing and get wrecked.
Bitcoin is never a slow profit generator is only based on the amount invested and how far you accumulate couple with your plan.