List your unicycle expenses and add it to a running total of everyone on the forums. You don’t have to list every item if you don’t want to but I did mines short.
Just add your name to the list along with your total and add your total to the community total.
I’ll start
Kris Holm 05 used- $250
torker lx- $90
torker tx- $115
radial 36er- $340 
pedals, posts and other upgrades/repairs- $100
XCcrev-$480
Unicyclist Community running total- $480
Off the top of my head:
Nimbus 24" Muni: $200
KH 2005 Hub/Crank upgrade: $200
Hub install: $70
Bedford 20" Trials: $400
Uni fun: Priceless 
“Real” Cost: $870
I am still relatively new so:
Bedford 24’’ Muni-$300
5’’ cranks, crank puller-$40
Pedals-$30
total-$370
Thousands. Worth every cent.
24" cruiser - $200
20" Torker trials - $240
26" Muni - $320
ISIS hub - $67
New cranks - $88
Total I’ve spent - $915 (not including some little stuff and things I’ve gotten as gifts…)
Running community total: $3892 (+thousands)
20" sun $110
24" Muni (homemade) $150
26" torker $120
36" Nimbus deluxe $500
Total $880.00
$ amount increases impulsively!
some weird math you got going on there.
Hmm my calculator must have had some internal error/malfuntion 
XCcrev- 895
EDIT: You dont need to know 
learner-100
kh shin pads-60
k1-490
shipping-~50 total
$700
Does traveling to Unicon (and other events) count? If so, even I don’t want to know. $30,000 is probably a way-low estimate…
Upgraded nimbus ISIS trials - $900
Second hand KH 04 muni + upgrades to it - $400
Pads - $80
New shoes because unicycling wrecked my old ones - $120
New Jeans because I like riding in them - $80
BC plates - $70
BMX front wheel - $50
Replacing broken parts, shipping, random other costs etc. - $50
Total - $1750, wow I didn’t expect it to be that much . It’s worth it though. And my parents probably paid about $750 of the above costs so thanks to them.
Try searching first. This is what I got using your title.
Some threads that have already been posted on this:
http://www.unicyclist.com/forums/showthread.php?t=59167&highlight=How+much+have+you+spent+on+unicycling%3F
http://www.unicyclist.com/forums/showthread.php?t=29846&highlight=How+much+have+you+spent+on+unicycling%3F
There was another one (that I posted my expenditures in) but I didn’t see it in that search.
And similar:
http://www.unicyclist.com/forums/showthread.php?t=51504&highlight=How+much+have+you+spent+on+unicycling%3F
probably about 4,000$ total.
a lot of it on trips.
Into the thousands, most of it on trips, but quite a bit on various parts.
Unicon was so well worth it though 
Not much on unicycles (I gues like 1500€ but in 12 years). But I dont want to know how much in traveling. Since the last 2-3 year I didnt spent money on unicycling I got a little from it sponsors and show riding is great.
KH 20 07- $650.0
Multiwheeler stuff- $450
Magazines- $25
I would say close to $4k if not more.
In correct order from 1st unicycle to last unicycle.
1) Skateboard unicycle (Prototype) = $200
2) Learner machine = $80
3) Torker TX = $250
4) Project unicycles = $1.5k in total. Maybe more.
5) Coker = $900 for coker and another $500 for modding it.
6) Motorized unicycle for my disabled friend = $1k
Everything 
Way too much But its worth every bit.
Spent on Unicycling
Bellow is my expenditures for the last 2 1/2 years.Keep in mind that my prices include shipping to Israel and 15.5 VAT tax.
Learner Unicycle $70
Onza 24 $580
KH24 2007 $680
KH29 2005 $640
KH20 2007 $406.5
Pedals $200
Tires $100
Guards $70
FLUCK trip $1000
Gas on MUni
destinations $500
Various toos
and gloves
and accessories $300
Hospitol bills
and missed work
because of broken
Leg Priceless
Unicorn