As we all know, merchandise income is related both to origin and stats of one's team's players. I had a quick look at your team and league and noticed that you have no relevant US or even self-drafted player in your roster.The other teams of your league seem to be a bit ahead of you in that regard.
I don't want to discuss the realism of this merchandise calculation. In my opinion the allstar selection should be more likely to be improved than the merchandise thing - resulting in an approximation of the selection towards the merchandise values, just because it's a fan voting and no stat based one. I repeat, this would be just a logical consequence, I do not want to judge about the merchandise calculation.
Apart from these theoretical thoughts, I share the opinion that something has to be done about that allstar thing. But if an allstar nomination should be tied up with the merchandise calculation in its current state, some other improvements seem to be inevitable. Please have a look at
(130090.1) and
(143412.1).