Forget about Netfleet, best thing you can do is put a for sale page up on the domain.
I still think it's worth listing domains on aftermarkets.
I use Sedo and for my .com.au domains I also list on Netfleet.
For some of the higher value domains or ones that I'm not as keen to sell - I still list them at 'make offer' and set a high reserve (I don't think you can set one on Netfleet).
I admit it can be time consuming if you have a lot of domains. But there are bulk tools for adding domains on Sedo, I think also on Netfleet but I haven't used it.
I recently pointed a lot of my .com domains to their Sedo sales page, that took me a couple of days!