Not sure what you want for notice? They already come out a week and a half before the travel dates. The ones emailed this past Tuesday 6/07 were for departure next weekend 6/17-21. That's plenty, and I think way better than most other airlines offer on their last minute weekend deals.

No, the main reason I haven't booked one in the last few years is price, plain and simple. Back in the good old days, the savings were significant. Now, on the routes I watch, the prices are barely better than the regular sale prices. DFW-CLT is frequently offered for $144 each way, with a 10 day advance. This last NetSaver had it on sale for $134. That's hardly the sort of bargain I'll get excited over...