I posed these questions on my favorite r-- forum, you may find the results interesting:
Describe your financial arrangement (for both SDs and SBs)
409 votes
32 (7.8%) No specific allowance but gifts, dinners, etc.
181 (44.3%) PPM (or PPM plus gifts/extras)
107 (26.2%) Weekly/monthly allowance
25 (6.1%) Cover all living expenses
64 (15.6%) Other
What is your emotional connection to your SB/SD?
Tell us how emotionally tied you are to your SD/SB, or is it just for kicks?
408 votes
41 (10.0%) No emotional connection; it's just physical
178 (43.6%) Some emotional connection with limits (including FWB)
124 (30.4%0 Deep emotional connection
65 (15.9%) Other