Arena: it grants an increase to the weekly merchandising income.- 200k upgrade = from +3k to +7k per week- 500k upgrade = from +5k to +13k per week- 1M upgrade = from +12k to +15k per week- 2M upgrade = supposedly from +15k to +22k per week- 4M upgrade = from +22k to +26k per week (this means it would take 160 weeks at best to repay the cost, thus more than 3 years in real life).TV&Radio Station: it should grant an increase in the weekly merchandising incomes as well as soften the decrease of fans attendance to your arena after a lost match. However, it’s hard to define the practical effect on this two aspects of the game, since there is a lot of unpredictability. Not enough data available on its effectiveness.As of now, the only effect seems to be an increase of +3% of the season ticket sales with the level 2. However removing the structure didn’t take away that bonus, so maybe that’s not an answer too.Merchandise Store: it grants an increase to the weekly merchandising income.- Level 1 = +10k per week- Level 2 = +15k per week- Level 3 = +20k per weekUnfortunately, this means that the net profit (excluding the weekly maintenance cost) is always 5k, regardless of the level of the structure. Until further data is available, it would be better to avoid the level 2 and 3 ones, since the only benefit would be a reduction of the overextension tax.