Jeez, there aren't even overpriced daggamalt/moonspill/haste or stat pots to buy for T1/T2 relics
T3 at least offers shards, so you can always sell them or give away. I still don't have a T3 weapon on my main, but at least I didn't have to farm so much gold for faction gear, which is superior if you want specific stats. Shards are also a way to transer the time invested in your main to your alts.
T3,5/T4 lets you buy several different sets for vanity/power (f.e. healers and tanks might want 2 sets for power) - it's a nice relic sink, but not for everyone unfortunately...
After a few weeks, T1/T2 is just collecting useless relics hoping to drop a weapon - you already have a full armour set and you can't buy a different one... or anything else.
Another thing is that from a healer PoV, it's reasonable to raid T1-T3 only if you want weapons/accessories or vanity armour - raid armour is useful only if you don't have faction pieces.