Most accept that not every adventure drops granite, not every Valiant drops a follow-up adventure or that not every Pirates drops a ton of iron and steel swords. The premise to the OP's suggestion seems to be that BLT/CLT/HLT adventures must drop the most valuable component of the loot 100% of the time. I disagree with this completely. BB could just as well increase the chance of getting 100 beanstalks to 10% or 50%. That way people will factor in that there is a possibility that they will miss out on the big bean reward. The only thing I see wrong here is that 0.5% is so improbable that people disregard the chance of it happening.
OP justifies "fixing" the loot by claiming it's a russian roulette if playing the adventure was worth it or not. News flash, this is the case with all adventure loots. The fact that 99.5% of the time you do get the reward that you were hoping for is a luxury.
You are free to suggest changes to the game of course, that is what this forum section is for. Don't take it personally though if people don't agree with your suggestion. The suggestions need to get critique from peers to show the pros and cons of the suggestion.
You personally must realize that, were you to read a bunch of game suggestions, you would agree with some and hope they got implemented while you would disagree with some and rather did not have them implemented. You are wrong to insult people just because this particular suggestion gets negative feedback. It is not about us "wanting nothing to improve". It's really quite straightforward. We don't like your suggestion. If we did, we would be posting positive feedback. The feedback is also an indicator to BB about how the change would be received. Therefore it's important for us to voice our opinions about your suggestion. The sort of "If you don't like it, don't comment on it" mentality that you seem to have is not appropriate here.