A high PPP is BAD for associates - it generally means they're really good at wringing a bunch of productivity from you, the hapless associate.
PPP ca be a misleading statistic. At some firms the difference between the highest paid and lowest paid partner can be a factor of 9 or more. IF PPP is $1M, you might see one partner (big rainmaker) making $3M with a large group making $500k. There are even some firms where the most jr. partners take a pay CUT from the most senior associates for their first few years as partner. Non-equity partners skew this even further. Finally, the PPP numbers are often manipulated with creative accounting.
All shareholders/partners/owners, that are considered active and not passive owners, of any company must take a salary and pay social security and medicare taxes on that income.