I think the seasonal "sets" (including all items and emotes) should cost $15 each.
Why? Because in order to get those items, you had to be subbed for that time period and complete the event. Fair is fair. You want the items, then you have to pay the same as the rest of us did.
The fact SE is offering the items for $2-3 is an extremely good deal. That's about 80% of what it cost the rest of us, plus you don't have to suffer through FATEs.