Let's be honest, It's a free to join forum with quite a few members, When you don't delete a pm it's saved on the servers and therefor taking up hard drive space, I think 100 would be a good number but if I remember correctly it used to be 100 so there must have been a reason for them dropping the number, Maybe people were just letting their inbox fill up and it was using too much space, Of course they could've done it to get more people to buy premium but it's only $20 a year or $10 for 6 months, Even my broke ass would buy it if I actually got enough pm's for it to matter.