This is quite common on shared hosting, they oversell server space, and when many sites are on line and members on these sites start to use the functions the diffrent sites offer, the load against the SQL server gets to high.
All with a bit common sense would know that a highway with traffic jams when to many want to use it at the same time.
Most host with shared hosting service and low price fees are having issues with this kind of things, and they will never tell you as a customer that they have oversold their servers to keep them up for low price. they want to earn money, and you have to live with it. If you get to have long time issues, and keep sending in support tickets to your hosts about this, they will ask you to buy a dedicated server or a VPN, as that's where they start earning money.
You in other hand, have 8 to 100 users on line and you really don't have to, but they tell you that you must have a dedicated box in the end.
This is nothing more then a scam from hosts. They have shared servers, promise you loads of BW and server space, when they infact have far from the gear to actually let you have what they promise.
If you take your time and look at the diffrent hosts, and see what they offer, do you really think they can offer you 200GB of space, 10GB BW/month and lots of ram for IE 9$/month, when a dedicated box with the same spec costs 150$ ?
Might have to go to some other board system if this one can't get it's act together.
And these kind of statements are just something to laugh about, what do you expect to get ? You have so many people giving support for no pay at all, they take there free time for us members and work their buts off to make progress at the same time they give support and keep your sites safe from hacks etc.
Try out one of the paid CMS they have out their, and see if you even get half of the support from them, i know the answer as i have been there, you pay for their things, but you don't have 20% as much support as you get from here for free. Also, they have huge problems with sites getting hacked with their software.
So by all means, think what you want to think, and see what you see.
It doesn't take a genius to see all you get for free here eather