I’m a hybrid member, and I probably only own AUL direct because I didn’t do my research and bought on impulse, but to @CVG’s point we definitely get more than $750 a year of value from our Y-card benefits. Two Moonlight Magic events this year alone are worth around $1k (and perhaps one of them we wouldn’t have done if we had to pay out of pocket but the other is a trade off for a different hard ticket event)— plus a couple hundred saved from Sorcerer’s Passes, and at least a few hundred in dining/enchanting extras/merch discounts, etc. I’m not going to try to bother counting free sodas, but at Disney prices it would be a few hundreds bucks (we live near DLR and visit star view station most trips). Plus of the maybe $2-3k we’ll “save” this year, it’s all tax free.
Of course, two major caveats here: (1) you would theoretically still have $15k in your pocket at the end of the contract (but my “savings dividend” would eclipse it over a decade) and (2) all of my savings dividends are only earned by spending even more money. If my husband hung out here, he would tell you that yes, we got “free” MM tickets, but it came with a cost of 4 round trip tickets to Orlando and several hundred dollars spent on food and merch at WDW over the long weekend trip we took because I really wanted to do Epcot MM…
Long story short, the Y card only saves you money if you were pretty dead set on blowing lots money at WDW and DLR in the first place.