You can spend alot... but you can always do it with low budget having something relatively decent. With "relatively decent" I mean, something that surfers would pay for.
Here is the prices breakdown:
1 ) Hosting - > $250/month
2 ) Carma + NATS (because it's nice to have affiliates) - > $2000 For instal + $300 per month.
3 ) Tour Design - > $1000 (webinc Reality package #1)
4 ) Promo galleries templates - > $200 for 4 or more decent templates.
5 ) Content - > about $5000 for 500 DVD scenes. Here is comes a bit complicated. If you find some wholesale/blowout package you can find it even cheaper. also if you buy all the content at once, you will have much better price. Basing on my own experience, you can buy 150 DVD scenes for near $2000 (sometimes even less) and put 100 of these scenes on a site... that's enough to start. then use the remaining 50 scenes for updates 3 months adding a new scene every 2 (two) days... so let's say you sxtart a modest paysite with $2000 worth of content. I will not tell you where to get these prices, but as you are content producer, you should already know who your competition is and what are they doing.
So, you have a startup bill of $5200 for content + NATS + CARMA + Tour design + Galleries templates the first month
Also you have a recurring bill of $550 for server + NATS + CARMA
If you want to do it without NATS and CARMA you can use the ccbill affiliates interface and
http://gallery.menalto.com/ as CMS. Don't go with sitedepth, it's unable to handle load and data growth properly, so gallery is the only real alternative. From all this, you have just stripped $2000 one time fee + $300 monthly.
Going the cheap way you have these expenses:
A startup bill of $3200 for content + tour design + galleries tmplate design
A monthly bill of $250 for the server.
Assuming 3 months of runtime (this is the content you have bought) yo will have a total expnse of $3950. After that you will have to buy new content and probably some more galleries templates designs.
So, going the cheap way you can have your paysite for $3950 ($4k).
The not so cheap way (with NATS + CARMA) it's $6850 after 3 months.