Well....let's see.
I already attended Katsucon, Anime Boston and NY Comic Con.
I had planned to attend A-Kon again.....but just had to cancel my plans due to 'family medical issues'.
I will almost certainly attend Otakon and NY Anime Fair again later this year.
Other possibilities include San Diego Comic Con (already have hotel res in case I actually go this year

), Anime Expo and possibly Providence Anime Conference.
FWIW.....I only started attending anime cons in 2004.....as Otakon was my first.....and I was sorta coerced into attending it.
If at that time, someone told me that I would attend 20+ cons over the next 4 years....I would have thought they were NUTS.
In 2005....I attended only 3 cons.....Sakura Con (Seattle), Anime Boston and Anime Expo.
In both 2006 and 2007....I attended 7 cons each year.....at various locations around the USA (Anime Boston x2, Anime Expo x2, A-Kon x2, Sakura-con x2, Anime USA x2, Otakon x2, Anime Central 2006 and NY Anime Fair 2007).
And yes...I've racked up a lot of airline miles with Delta over the last few years......but not just for anime cons.
My reasons for attending cons have evolved over the 'years'........as I've attended in various 'capacities':
Initially, I was 'only' a general member.....sitting in on panels and attending some events like most people.
In 2006....I was coerced into working a few cons as a 'member of the press'......and came to like the added benefits that come with such badges....but ultimately, this sort of work wasn't 'me'.
Early last year.....things changed yet again (something that may surprise some people).....as I started receiving exhibitor/dealer/industry badges at some cons...due in large part to 'helping out' a certain R1 anime studio at various cons.

FWIW, I have come to enjoy this the most....especially the interaction with other fans at the 'booth'......and is largely the reason why after attending 20+ cons....I still haven't lost interest........yet.
The one thing that I haven't done yet....is volunteer as a staffer.
Above all else.....my primary reason for attending cons at all.......has always been to meet up with various friends and acquaintances.......as IMO that's the best part.
A.J.