In the Prague thread we note how the rates differ. For one thing they charge a much higher rate on Rentmen than on Romeo/Hunqz because RM is $100/mo while Hunqz is free. Plus most clients from Romeo are local while most from Rentman are American tourists. Also there's a big difference in local currency rates rather than Euro or Dollar rates. Normal rate in Prague is 3000 Czech Koruna ($120) up to 4000 ($160). But in Euros it's often E200 ($260). Even with exchange fees the Czech K rate is a bargain over Euros. In Zurich it doesn't matter much since a dollar and a Swiss franc are about equal. But the rate there is F150 because the guys handle more clients per day. In Germany rates are traditionally very low, often 100 Euro, so that affects Swiss rates too.
Since most of Europe is on the Euro, it doesn't really matter much unless you can get someone to take dollars instead of the same number of Euros (rare). But in countries with their own currency, the local currency rate is always lower than the Euro rate, and Hunqz is always lower than RentMan.