Not sure I would want to pay an SP to “sleep” with them.
I would prefer a lower all inclusive price.

If the extras are for stuff that wouldn’t interest me; pissing, spanking, Dom, cock humiliation, shin kicking etc then I wouldn’t want them to be included in the price.
When I visited parlours I wouldn’t automatically pay the extras until I knew I was into the SP. Opted for basic no thrills 30minutes for first meet, but sometimes I knew within minutes I wanted the full works, RO, rimming etc, OWO, facials.
Make sense for punters to have a menu of optional extras but sometimes that can cost more than an all inclusive price.
Anal tends to be the expensive extra that I can do without unless it is inclusive (rare)