The 'Net is my market, I shall not want...

I keep opening the lj entries of people with ad-sponsored accounts and getting huge pop-up things that gray out the page you're looking at and won't allow you to close them until they've fully loaded. Has anyone else been having trouble with this? There are a few things I haven't commented on because I closed the window rather than deal with waiting ten seconds for an ad I didn't want to see to load.

(I'm particularly wondering if those of you with paid accounts get exempted from this, as every so often I contemplate upgrading... on the one hand, I like my basic account; it has everything I need, and I won't be able to get it back if I change my mind, but on the other I do use this an awful lot, and possibly it would be the thing to pay for my web hosting, so to speak.)