are there a lot of members like ILOVEYOU who don't have forum profiles?

[SCAP]

They made a bunch of offers on my Doom 64 (which was already spoken for, the trade is a formality since key'd been revealed to me) with interesting games I wanted to ask more about but there's no PM system in the trades so unless it aligns with a forum username I don't know how to contact them.

already have 1st Disciples but Disciples II and Dungeon Crawler could be interesting

 

[Curtainferno]

In this case, you could just click on "Members" at the top of this page, type in ILOVEYOU in the "Find member" search box, and you'd be taken straight to the profile page of:
@iloveyou
They haven't been online on the forums since July 9th, though, so that might still not be very helpful.
(And by the way, I find it a little eyebrow-raising that ILOVEYOU has completed 574 trades on IndieGala, but only has 124 games in their Level 0 Steam account.
And by the way #2, all of ILOVEYOU's offers in your screenshot are lowball offers, though I guess Dungeon Crawlers HD is rare enough to be not too horribly unreasonable, if that's actually a game you have a strong interest in, despite the 51% positive ratings.)

Now, there are some cases where a user's trade profile name (e.g., "pos") doesn't match their immutable forum name (e.g., "purpleamuletfiction"). In those cases, I think you'd be pretty much out of luck, if they've never posted anything on the forums.

(Edit: I hate when I forget the obvious! )

 

[tugamix666]

Now, there are some cases where a user's trade profile name (e.g., "pos") doesn't match their immutable forum name (e.g., "purpleamuletfiction"). In those cases, I think you'd be pretty much out of luck, if they've never posted anything on the forums.

In this case, you can try contacting the user via Steam if they have it connected to their IG profile, by clicking on the username/icon in the trade profile it'll lead you to the Steam profile and you can go from there either through a comment or adding to friends and using Steam chat.