I really don't care, I watch the football, not the shirt sponsors. outside of the shirts being clearly different for the opposition(which isn't always the case) and preferably not making my eyes bleed(Barcelona have been pretty damn bad with this recently) I couldn't care less if you couldn't make out the Arsenal badge for sponsorship lettering.
THe only time I'd have a problem if at corners they walked up to the camera's and plugged their products.... unless it was funny products, Suarez advertising horse feed or dental practice, Jones advertising beauty cream, Young advertising scuba gear, Giroud advertising a male escort service or some automatic heimlich maneuver device
In fact, I'd welcome more sponsors on shirts AND a legal maximum ticket pricing.
If Arsenal games cost £20 a ticket, and the shortfall was made up by two more names on a shirt, awesome. It would also enable lower epl teams to make up some of the difference ie for Arsenal we could lose say 50mil stadium income, but gain that back from sponsors but say Wigan already charge little and have low attendance but being able to have 2 more sponsors might bring them in another 5-10million, it would give the bottom half of the table a slightly better chance, ish. The being a top team now and getting bigger money also accounts for new fans to football, they predominantly get drawn to better teams. So it's hard for lower teams to sell out stadiums and impossible for them to come up with the £300mil it takes to build a 60-80k stadium, and then would have trouble filling them up.
I always forget how the german league makes all it's cash, but they have stupid low ticket pricing in general?