Most (all?) programs have a global cap. Where this one is unique is lack of per transaction caps.

A $2k roundtrip ticket gets you flat $2.25 from Orbitz [0], or $112.00 from Jet.

To hit $1k per year off the 5.6% rate is ~$18k spent on flights & hotels. I think most people won't come close.

[0]: http://www.ebates.com/coupons/orbitz/index.htm

I've made more than $1000 on more than one program (discover deals, shopathome, possibly splendor or close, somewhere in the same range on topcashback). None of those have per transaction or total limits.

I don't spend on travel, though, so rules may be different there.

I resell, so I'm also explicitly excluded from jet's program.

I wouldn't expect the average consumer to be a reseller, but that's an interesting point to consider.

Travel is a heavily restricted category. I wasn't able to find complete terms and exceptions for all of the programs you mentioned quickly, but for example, TopCashback caps flights from Orbitz at $3 [0]. Discover Deals doesn't seem to support flights besides one weird deal with CheapOAir [1].

[0]: https://www.topcashback.com/orbitz/

[1]: https://www.discover.com/credit-cards/deals/all-deals.html?c...

Splendor has 2% no limit https://www.splender.com/#!/stores/75/orbitz