I've had a memorable experience at the airport as well. But, I still like them. 3 or 4 times a year, whenever I can get several - scheduled with different MSPs, I'll schedule them; and I only do it when I'm not flying. The least I've done it for was $125 fees and $80 reimbursement. Normally, somebody will reimburse my parking, and occasionally I'll even get mileage.
To get past security, you need a ticket. I purchase a one-way refundable ticket for $240. After completing my shops, I either stop at the ticket counter and tell them I had a change of plans, or I call when I get home, and get credit. The charge and credit are both on the same cycle.