Haha, trust me $5 for 1 month sounds MUCH more appealing than $12 for 3 months. Its mainly the problem of my parents not thinking I will continue to play.
Does it really hurt BB other than not having that guaranteed money? If you can get more buyers for 1 month than for 3 months, I'd take it because at least 1/2 of them will continue buying and thats $3 profit by the 3 month time.