Hoard and then use in spurts
 

I tend to hoard for long periods of time because (a) most of my travel is for business, and (b) I'll buy tickets for leisure travel if they are relatively cheap. I generally try to achieve at least 1.5 cents per mile on my reward tickets, which means that I'll use miles for a domestic ticket (25,000) only if the ticket price is $375 or higher. Most of the time, even for transcons, I can find tickets cheaper than that. Of course, sometimes when the fare is very high, there is no availability for FF reward tickets. :(

However, when I do use up my FF miles, I tend to do so in clumps of 100K+ because I'll get tickets for the whole family for a vacation trip. I recall back in the late 1980s or early 1990s, when Continental changed its reward mileage thresholds (from 20K to 25K for a domestic ticket), my wife and I cashed out almost all our miles. I think I'm back over 200K for Continental and close to 500K for American, with smaller amounts in US Air, Delta and United. Time to cash in again! :D

hoarder.

I've only been playing the FFM game for about 2 years but i got ~160k in AS, 23k in CO (which is earmarked for a trip to BOG/CCS from TIJuana, Mex) and ~50k in NW with about another ~70k to go this year alone.

not sure what i'm going to do with them except I have a few of them :o

Definitely a user.

Hoarder, then splurger :D . Every mile cashed out was for long haul business or first.

Hoarder....but I'm not cheap and I always use protection.

Definitely a user.
2MM+ AA miles and only have 45K in bank.
850K Marriott and have 2K in bank.
750K SPG and have 75K in bank.

I was a hoarder until I got to about 1.5M on US, another million on other airlines, 400K in Marriott and a few hundred thousand elsewhere.

Then over the last 2 years I have switched - down to about 700K on US and burned about 300K at Marriott (although it's up to 400K again).

Mostly a hoarder. I have only used mileage twice.

I have about 275K lifetime on NW, used for 2 flights.

March 02: Used BUF-STL so I could go to a conference there, lowest fares were upper $300's, which seemed ridiculous off season, over that short of a distance. Glad I went cause got to know my now wife at that conference.

June 04: We spent 200K of NW mileage on BUF-FCO for our honeymoon! So mostly hoarder, but spender when well worth it!!! :)

I have around 40K on Delta, I think 28K on US Airways, a few segments here and there on AirTran, JetBlue, and Southwest that I don't have a good handle on.

I was getting close on Vanguard Airlines before they went broke. A couple of flights BUF-MDW and BUF-MCI. They were great for keeping Midwest flights low here, I miss them.

Earn 'em and burn 'em.
:)

I'm a hoarder up to a certain point. I like to make sure I always have x (ie 500k) miles in my account. I'm still building my Hilton points balance.

Becoming less of a hoarder
 

I was strictly a hoarder of miles until about eight months ago when I began treating myself to air travel I could never afford to purchase with real money.

User here. Love that DL/Af codeshare. Have had lots of 100k Skyteam awards FC flts on AF. Great use of miles.

User *cough* *cough* any of you hoarders turned givers that wish to donate feel free to PM ;)

Definitely a user. About 1.6 million miles earned lifetime, and about 140K miles total still in all the accounts.

Every single mile was spent on free travel in coach, and some were used in memorable mileage sales (40K to BKK on DL, 25K to HKG on CO, 20K to DUS on CO, etc.).

Both! I take all the trips I can using miles/points. However I do not spend 50,000 on a $250 ticket. I always want to have more miles in my accounts knowing that they will be worth less soon.