I wanted to try that and I have a few airsoft guns I could use but some people I know tried it and said a lot of people cheat and stuff and its expensive.... yea mainly because its expensive. Looks like a lot of fun though!
I been playing for 5 years and compared to paintball it's super cheap. Of course your rifle will be as good as what you pay. But you can get decent starter rifles between 150 and 250.
Of course it's great to check your local area for groups that play. The group I play with had no problem letting me borrow a rifle to try it out. To me it's cheap and my Rifle I got on sale for 240. It has lasted me 5 years through rain, snow, mud, falls, bumps, and my upgrading skills ( surprised it still worked lol). At the beginning I only had my Rifle, 1 mag, 1 bottle of ammo, 1 battery, and I played with this for a long time until I got better and was recruited into a team.
We have gone to huge operations with over a 100 players. Big facilities and space. Last year we played at a closed down nuclear plant that is now used for SWAT and military training. They had tanks and humvees with CO2 cannons and mounted machine guns that use 100s of BBs a minute.
In the end the only expensive piece would be your rifle or sniper,shotgun, heavy support gun, dmrs, or smgs. They just about make everything.
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Once you have that starter package it should last for a long time. Or until your ready to upgrade. Like me my Rifle works fine but after 5 years I'm ready to try out the DMRs designated marksmen rifle. It has the range which is deadly in air soft and it also has your full auto mode just in case you get into a bad situation.
Its fun and good exercise. You meet really friendly people, many who are veterans, or active duty. You learn real life military strategy in combat situations and urban clearing of buildings. MILSIM ( military simulation sport).
Try it out if you got any questions I will gladly try to answer them and if I don't know I'll find out.