250x250 Size adsense ads have short of advertisers?

All the time it shows one or two ads only instead of three

[matrix_neo]

I use 250x250 ads on my website, for months it shows only one or two ads but on the same page I use 160x600 on the right, which is full of ads. So there is no shortage of ads. Now I am just thinking of changing 250X250 to large rectangle or mediam rectangle, will it help getting more ads?

[Fish_Texas]

I guess it depends on the type business you are in...I use some 250X250 units and they always show 3 ads. The 300X250 shows 4 ads.

Your idea is worth a try...Good luck.
Fish Texas.