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I already had some BNB and a few thousand stablecoins. The only risk involved with a project not hitting off is the potential loss of income that I'd receive from other staking sources. Right now, for instance, USDT and FDUSD have a decent APY; if I made more through them during the launchpool staking period rather than with the launchpool tokens, then it was a failure.
That literally never has happened! Just as a comparison, here are some numbers for the recent launchpool for NFP. FDUSD staking income is 11.87% yearly. Over a period of 7 days, and assuming you invest 10k FDUSD you "loose" (opportunity cost) 22 FDUSD. For that, you got about 118 NFP, which could be sold at launch for about 1.1 FDUSD / NFP, so about 6 times as much as the opportunity cost. And this is the norm, not an exception. And btw, in case you use BNB, you can keep them in the earning account and still receive the airdrops, so there is zero opportunity cost there.