This is an omnipresent debate.
Ethically: Only buy the legally licenced books.
Technically: The books by publishers will almost always be more accurate and better quality. Some of the lead sheets in the Berklee Book are deplorable.
Musically: We should all aspire to develop a repretoire and ear to make lead sheets of standards and jazz standards totally unncecessary.
Practically: When you play at a jam session or get asked to play a gig with some guys you meet on stage, if they're playing those terrible changes, you need to at least understand what they are doing, whether you do it or something different. Unfortunately, we've tested already one guy having the Hal Leonard book and others having the Berklee Book. There are a lot of omissions and additions of songs that make them not entirely compatible and some changes that don't work together. We used to have this problem when someone would bring the Chuck Sher books, which are quite good. 1/2 the band would yell out "Page 127!" and the other quy would be looking at the table of contents of each of his 3 or 4 Sher books to find which if any had the tune in it...and then worry about key and changes.
I played about 5 (well paying) gigs with some guys this year who just play out of the Real Book, bad changes and all and it bothered me musically, but did take the gigs. I had to bring my fautly, illegal real book and read the charts with them, lest I play minor chord while they were playing majors (Up Jumped Spring) or other traps. I talked to them about some "ideas" with some of those tunes, but they are married to what they play and they play their instruments well. I may chose not to work with them next year, but it was a nice boost for me this year.
Amongst my extended group of people who I play with, we've been trying to agree to switch to the Hal Leonard books and I think we'll get to a point where when someone brings the Berklee Book, they do so at their own risk because the rest of us won't be playing what's on your page, but we're not there yet and when we venture out to play in someone else's session or take the gig from a referral, I fear we had better not throw out our illegal Real Books yet.
On the subject of bass vs treble clef. We have to read bass clef as bassists. Reading treble clef is good too, because you may not have a bass clef chart, but if you have to pick one, we're bassists and people will at some point expect us to read a chart written that way.
Just my $ .02.
By the way, I gave Eric a bass clef real book and contributed to his deliquency. He seemed like a nice young man and I'm sure he will out grow it. I don't have to be super secret, because I have a theory that the existance of that book is not illegal and giving it away is not illegal, only selling it. I'm not a lawyer and I could be wrong, but we can debate that if anyone has actual knowledge.
Troy