Depends on how much and who as well as why.
I had a client who shafted me for £135 ($250 ish) even though I was only charging for the work done. His original bill was £360 and he messed me around a lot. Thing is he was another hypnotherapist so I decided not pursue him any further but he will not get any referrals from my site
)
It would have cost me as much to take him to court. Instead I know he failed to pay me because he was short of money so I just pity him for being such a fool and a liar. Time is too short to waste on idiots
)
Cheers