Another consequence might be an unavailability of a professional—lawyer, accountant, actuary, enrolled retirement plan agent, third-party administrator, or otherwise.
Some professionals might accept such a client if one is paid her advance retainer in an amount one estimates as enough to cover more time than one expects to work, after carefully considering the extra difficulties of working for a troublesome client. With the advance retainer periodically replenished, to avoid a risk of nonpayment for the next bit of work.
Others might be unavailable no matter how big a fee one might earn.