could someone please explain WHY they can't be put in the HQ?

I think, since each premium ship comes with its own berth, there is no need to allow it into the HQ etc. SDE is not known for doing things solely for the players' convenience.

yeah i do understand that part but i hate having to scroll passed every single premium ship just to get the one i need >.>

My guess would be that keeping them out of the HQ is the only thing keeping them from going into the trade system.

Currently I use mostly premium or event ships (MN EBB2, MN PCA, US PCV, UK ECV Emerald), and I hate having to remove my sailors one by one to put them in HQ, rather than putting the entire ship!

Prem and Event ships should be able to go into HQ, or remove the 50 sailor limit altogether (even better, but i know it's difficult)

Or u can bring a new HQ (P-HQ)only for Premieur ship and E ships, and elite crew.
If something place in that P-HQ then cannot trade.

maybe is good for SDE, with their next fix patch where all ships auto sell.
Pships can go auto in HQ.

or
bring a GOLD HQ by buy and all ship inclusive Premieur or rental or bb6 can park in Gold HQ without number limit, and no trade.