Hello!
I am new to the group. As I've just purchased an Eleven Rack. It came with PT11 (free upgrade to 12) with ilok. However I am happy with Logic and really don't want to learn another SW. Question I want to ask is; what will I miss if I use 11R without PT11/12?
Thanks for looking!

Nothing, as far as I am aware! You can download the free 11 Rack Editor if you want and should be good to go.

You can sell PT11 if you have not registered it and have some extra cash to feed your GAS habit!

oh and welcome, (I keep forgetting my manners!)

Also from what I remember Bojan uses Logic X......(?) he may have more info....

You won't be missing anything by working in Logic, except the input and output names, you have to know what input numbers (like Input 1, Input 2, etc.) correspond to the 11r counterpart (like Guitar Input, Mic Input, Rig output L, etc.). I made a post about the input-output assignments about a month or two back that should apply to your case. Other than that it is like any other interface, just make sure you download all the current Mac drivers and the standalone Eleven Rack Editor to be able to save, load, and adjust presets.

This is the thread with the Input-Output info, it is for Reaper but also works for Logic.

Reaper and Input-Output Assignments

You can take it a step further and use Mac's Audio-Midi Setup to create an aggregate device if you have another interface. I have both the 11R and an Apogee Duet 2 and I just leave my 11R hooked up to my FRFR monitor and have all the playback in Logic go through the Duet/studio speakers and my tracking audio go through the FRFR.

Nice one guys! That's a relief
@Downrazor11 some great tips there I will get my hands dirty!

Next question is where is the best place to sell the unused/unregistered out of the box PT11/12 (download) with ilok & reg card? Any price range ideas?

there are some things that you can do in pro tools with the 11R that you can't with other DAW's, just off the top of my head i can think of three.
embed settings
the eleven rack mini window
the 11R templates

What do you want for it?

I think they dropped the mini-window from the PT11 version, now it's covered by the stand-alone editor. Still, it might be nice to embed settings and have templates, but I always build and save my own templates and have never used embed settings so it doesn't impact my workflow, ymmv.