Skilled summons, what to do...

Got about 70 skilled summons in my "cage" now,. not sure what to do with them all.
What's the current use for them nowadays?
Selling them 1 at a time on the market doesn't work - too low value.
And you can't really search for them very well either,..

What do you do with them? Hoard every skill and up them to lvl 4 ?
Or, what?

hoard them for stacks of (4) or for uncommon skills I see alot for sale for 1 ep/bp, I don't know if anyone buys them but they're there.

I try to trade singles for singles that I need.  It's a slow, tedious process, but I've been able to get a couple stacks a week of whatever skill I need this way.

i usually post a trade for a soul of wisdom or evo... something I might use if it's a skill I know I don't want.

Now that raid crystals will be tradeable again, though... ya might try trading for some of those.