If you are into variety and not experiencing any surprises (the women are totally nude), Germany is a paradise for the hobbyist.
Four to eight times is an exagerration.
For someone who has to fly to Montreal from south of the border and take a hotel room at his own expense to indulge in outcall services, the pricing is comparable, in fact.
For someone who lives in Montreal, I will concede that it may be a different story as your incremental expense is just the price of a phone call and the SPs fee.
A friend from Toronto who I've traveled with and is a longstanding TERBite (and in fact turned me on to MERB) will vouch for just how unique the experience of indulging in Germany is.
The club scene in Germany is on an entirely different plane in terms of uninhibited-out-in-the-open sex.
For the puritanical amongst us it is just beyond belief.