I remember that some that some "study" was conducted here by some members. The result were if you invested the same amount in all the major ICOs since the beginning of the year, you would be at a profit. And that would be even bigger if you selected only the good ones.
Yeah, I recall something similar: random 10 picks, even if 8 dies, 2 that make >5x profit more than covers everything. Of course, who has enough to make 10 picks. I don't even have 1 BTC and with majority ICOs in ETH, I hesitate to change BTC to ETH.
I don't think there is any kind of restriction on the minimum investment, as long as it is realistic (so not 5000 satoshis). For this reason, instead of 1
BTC you could put 0,1
BTC, or even 0,05
BTC per ICO. Or even less if you do not have this.