Questions to consider:
Are you open to shipping them? It's easier/cheaper to ship without bindings. Another option is to remove the bindings and send them in a separate package. I once put a pair of skis on the local craigslist, but I ended up selling and shipping them to the east coast.
Might you want to keep the bindings?
You can always post that you're willing to sell with or without bindings, and let the buyer choose. Post with the BSL - there are people with short BSLs out there who might be happy to have the skis ready to go without a remount.
I definitely think it's worth it to sell when people are excited and preparing for the season, not the end of the season. For example, I just sold my road bike. I don't think it would have sold well in the fall. People buying in the fall are typically bargain shoppers. Similarly, I sold my old motorcycle in the summer. I'm thinking of selling my motorcycle and getting out of the game - and I would definitely rather do that in the spring than the fall.
I find that with used skis, people really are shopping for a bargain, anyway. Often I let my emotional attachment overcome reality. When you're setting a price, think, "Would I buy a used ski at this price?" If you're more interested in getting stuff out of the house than in making money, it's worth it to price a little low. IMO. Some people are great at selling and even sometimes make money on the used gear that they then resell. I've never pulled this off.
The flip side is, wait too long, and it's another season gone - or the end of the season - and you still have the item, no cash in hand.
Sorry if this is too much - you asked specifically about skis and bindings, not about the general idea of selling. And I am pretty sure I am terrible at selling.