^^^ This. So yeah, an external host would fix that, but it has it's up and down sides: You have some copyright protection build in by uploading to TPB directly, you are in a way supporting TPB because you entice people maybe to donor to the site. So those are advantages, the disadvantage is that people who don't donate can only see the previews, but then again: the percentage of lurkers who don't contribute is way higher amongst non-donor member...
I was a donor and later given free donor status because I had my then GF become Something tar Member, but now that she is gone so is my donor status. If the people in charge get some if the mess sorted and the ship back in the right direction, I'll deffo donate again.