So you're saying you get 3 points for every Interval dollar spent? Is that JUST Interval expenses or all travel expenses?
I've never heard of a card tied to Interval in that manner. I and I think most people don't spend that much on strictly Interval fees to make such a card worthwhile.
If it's all travel expenses, on the other hand, and they somehow know that "Interval International" is a travel-related expense, that's pretty good. Assuming those points get you something good.
Just to make mention of other cards that might be good travel cards in general, the Chase World of Hyatt card gives you 4 World of Hyatt points for every Hyatt dollar spent. Also, 2 points for "local travel" and 2 points for airline travel. And 2 points for a few other categories but one point for everything else (the vast majority of monthly purchases). Good if you use Hyatt more than a little bit.
As to the latter, I paid a $2000 plus Hyatt maintenance fee and got only the 1 point per dollar spent. But then I fought like heck (which means I talked to person after person and finally got to a senior supervisor) and finally got the other 3 points per dollar added to my account two months later (!!!). So I got one free night at a Hyatt hotel (a $200 to $300 value) for paying my maintenance fee.
I've got a credit card offer which will give me 80,000 American Airlines travel miles if I use the card to charge $4000 during the first four months. I haven't looked into the precise details of the offer but that sounds pretty good to me as well.
But points for just Interval? Never heard of it.