Well its not really profitable when you are gonna stake few bnb cause the participamts there are a lot and you will definitely competing with other users for reward. By those clause you mentioned about investing on launchpad but not staling to buy them then you are practically saying its not on launchpad like a private sale or some sort of ICO prior to laumchpad. Cause joining Binance you are require to stake your bnb just to earn that or invest with.

anyway if you are talking about investing in these project that are getting launched through binance launchpad, as I've seen so far, most of the project that get listed in binance whether having launchpad or not, usually always grow at the end of the day, though its not uncommon to see the price of the coin tanks first the first day of listing that to be expected, most of coin nowaday giving airdrops to people after finishing certain tasks, so these people gonna dump it but its also good opportunity for us that want to make investment because that usually where you will see the lower point of price you might never see again, so far the project like ENA, Wormhole and so on, even XAI and the likes are growing good, so its definitely worth a try.