I felt the same way, 10 was the original and 10 is where I will stop, was my thinking.  Even when I started 10 I had a plan to gold specific guns.

This went well until about level 75 when I started getting twitchy, once I got to 80 I levelled up as fast as I could and hit the prestige button, couldn't resist.

If you are happy at 10 then stay there and level up the guns and complete the challenges, for me I prefer to prestige rather than gold the guns, thats me.

By the way I also have it in mind to stop at 15 (currently 13), yeah we shall see.

Ooo that's a tough one.  I was stuck at 15 for a month before they released the last 5.  It was really tempting to stay there but I took the plunge to 20 and have that nice X over my skull.  My only complaint is that the X is a little small compared to the V.  I'm not sure which looked better.  As to the OP's suggestion, of course, I would have rathered that they had new and different titles/emblems for the 11 to 20 prestiges.  I'm guessing that they really where an afterthought and they didn't intend to include them in the game from the beggining.  Ergo why so little work went into creating them.  My guess is that too many people got to 10th prestige too quickly and they only introduced the new prestiges as a way of keeping the interest up.  If I had stayed at 10, I would already have 99.99% of all the titles and emblems and probably wouldn't play as much as I do.  So it was a smart move on their part but it would have been nice if they had put a little more into them.

I'm glad to be one of the "X Men" - also glad I'm at 20 and don't have to Prestige anymore.

Gonna work on some gold guns now.

I went to 11th just because I was at like 10th level 70 when they added 11-15. At 11th I managed every perk pro, and every weapon (except lmg) to level 30. I then got peer pressured into prestiging. Biggest mistake ever..... I spent a good 6-7 days play time on 11th, and trying to get everything where I had it is a PITA.