With all due respect, IT IS spamming the site. (Especially when the same message is posted to multiple boards--see the IL board for another copy of this message). More importantly, by the rules of the "board manners" it is prohibited. Nothing against Play Ball, but if everyone that had an academy or product openly promoted it on this site, there would be nothing but these annoying solicitations everywhere.
It is bad enough we have to put up with all the subliminal advertising and self-promotion that goes on. Some of us live by the rules and would definitely appreciate it if more members did.
If you want to advertise--at least pay the site for the ad.