First let's not delve in to the extreme. No, suggesting BB takes my money is not a suggestion to improve the game, it's functions, it's interactions, it's flavour.
Making a suggestion that has been made a thousand times does not count. BB altering a suggestion to make it workable in the confines of the system does not count. If I said 'add another Potential level' and they said it could only be done this way still counts as the suggestion.
Only suggestions that get used by BB would grant the LS and they would have to be a game modification. Suggesting less ads would not work.
Yes the size is not important. Making the game better, more fun, more intuitive etc. makes the game better. Also how do you measure 'size' of a suggestion?