Master111 said:
What Will the upgrading of accessories bring to me ?

@vgates said:
Some do. See below.

http://en.strikermanager.com/wiki/index.php?title=ESTADIO

Accessories

There are 5 different types of accessories/improvements for the stadium, and each has a specific effect.

Grounds: each level of improvement reduces the possibility of injuries by 2%
Entrances: each level of improvement increases sales profits by 1%
Lights: each level of improvement increases revenue from billboards by 5%
Dressing Rooms: each level of improvement improves the motivation of the players by 1%
Scorer: each level of improvement increases revenue from billboards by 5%

*Note: each division has certain requirements regarding necessary accessories that every team must comply with. If a given accessory is not at the level mandated by the league, a percent of the revenue from home games will be deducted. On the accessories page or the financial page the required levels and whether or not a penalty has been applied can be seen.