For the last few years, I've been using my Lunatic deck for readings for months at a time. I've never really been a big collector or much of a flitter. I already had one deck I knew really well.
I did the ODW with the IIT/TdM, and never really grasped the point of it until now, years later, after I matured some. I thought the point was to be able to study the deck, but that wasn't quite it.
For awhile now, I've been wanting to par down my collection since I have a different focus nowadays. I like reading with less and having things simpler. I like having fewer decks since it aligns with my focus, which is to read. I just want to read and then be available for questions or discussion. I think the IIT aka. Tarot of the Toilet People is brilliant. The hint of the thing is enough to read... plus the wonderful meld of all the colors.
I don't want me spending the whole 30 minutes talking when they needed the 30 minutes to talk. I want to only say what needs to be said have them have their 30 minutes, or have them on their way if they only needed/wanted 5. If they have 30 minutes for a reading, I don't want to be talking more than 15 of that.
I am keeping a few of my fully illustrated decks. I plan to use them occasionally, and they serve specific purposes.