Well, vB is known to some to be rather resource intensive - compared with some of the alternatives out there.  I would just be sure that as the support tech mentioned you be careful what other scripts and services you have running on the same account and you might search around the Web to see if there are any hacks, plugins or update you can do to slow down the resource intensiveness of it. 

Search the vBulletin forums too here:

http://www.vbulletin.com/forum/index.php

I think I remember seeing a few helpful post before when searching for "resource intensive".  Hope that helps!

I've been running a vbulletin and vba site for years (2,000+ members).  Usually, it runs fine.  But it is highly frustrating when LunarPages arbitrarily decides that the resource load is too high, then shuts your site off by moving it to a non-production server that is incapable of running vbulletin, then tells you to fix it (while it is on a server that won't allow you to see any results of any "fixing") or move to a much more expensive dedicated server.  I go through this about every year and a half it seems...the funny thing is...I don't add any scripts that would increase the load. 

IMO, it all comes down to which tech is working that day.  There is no consistency it seems.  I've even asked tech support about adding certain scripts and I get their approval.  Then, after everything has been running smoothly for a year or more (in my case over a year and a half), bam! Out of the blue, everything they told you previously is forgotten or reversed. I suspect due to just having different techs to work with and lack of communication between them.  I'm currently going through this right now. 

I'd consider moving to a different host if it weren't for the fact that for the most part, the techs are pretty cool.  Every once in a while you get that one tech who just drums to a different beat than the rest though.  During that time, I just have to grin and bear it, tell my 2,000+ member base I apologize for the inconvenience and I'm working on a solution as soon as possible. 

Just as a side note, I think vBulletin's popularity has died off some too over the past few years - mainly due to the confusing licensing issue.  Also the previous issues with it being a 'bit of a resource hog shouldn't go without notice either. 

Apokalupsis, feel free to pass the word along when somebody has either been bad or good to you via the support team to feedbadck@lunarpages.com.  I know it always helps either way (bad and good) to know what peoples strong points are and maybe where they need some work.

So yes, as long as you are very careful - you shouldn't have any issues getting VB up and running here.