Adverts before playtime

Why do some developers put up adverts BEFORE the user (customer) gets in to the game play? Surely letting them play some of the game first, then hitting them with a well timed advert looks better. Personally, I find it really irritating when this happens to me, and I tend to uninstall the app, and that way no more ad-revenue to the developer.

Also, swamping an app with adverts is probably counter productive as too many ads will make people shy away from an app… and therefore less revenue. I play a couple of games a lot, and they have ads in them, but not all the time, and it seems the developer has thought quite a lot about where to put them. There are some games I’d love to play more, but the excess number of ads has put me off, and they have been uninstalled.

Just something to consider when developing an app.