We already have:
10080 Platinum for SoE boots.
15300? for 2.0 Piece.
5100 Platinum for each piece of Tier 4 armor.
A new alternate character can easily cost around 70k platinum. If you raid platinum is not dropping often enough to sustain a new character. A person literally has to go into an area where they get little to no benefit outside of the platinum itself and farm, taking away from raid time.
Instancing prevents most of the issues caused by backflagging. SSRA can be skipped entirely if you are able to kill Vulak.
There are so many people nowadays that can box SSRA and Kael, making those items trade able would just feed peoples alts. Assuming the people that can box them would even bother with the mobs. I haven't been into Kael or SSRA in at least a month, I have not killed a raid mob in either in quite awhile. Removing no drop tags would just encourage people to over farm. Just because I don't need an item now, doesn't mean I won't make that class eventually.
The server is well thought out progression wise. Adding trade able raid loot would definitely mess a few things up. The raid boss coin's was enough leeway imho, I know quite a few alts have benefited from that already. Also, I haven't seen an angry Sleeper Key mob post in awhile.

catthib, I carry 3 damage shield clickies. One of them works at level 1 from inventory.
Lower Guk Executioner Hood (Targeted)
King Tranix Brackencoat Mask (Self)
Lady Nev ? Thorn Cloak (Targeted)