I am saying it with very much experience in that field, a 2nd vendor will not only double the selling, but it might also motivate the first one to work harder, in addition to that the sells will always be better when your storage are full and as there are more booths at the market then more people are coming and some of them will leave with an extra copper axe that they did not intended to buy at all, what i am saying is that it can be a interesting if every thing will contribute to something, so you will have a reason to keep the Club running.
As a biology student soon finishing my master's,
I always get angry at unsophisticated cells that uses simple folding of proteins to do anything, all living cells has only 21 amino acids, they are so underdeveloped,
But they are amazing and they are able to create the whole world, just hate it, God annoys me, and this game is the same.
Thanks for the feedback. I will work on an update soon, that will make the early products more useful in the later game again.