I have done it a few times. The pros are obviously that it enables you to see someone you otherwise wouldn't (since you've decided visiting her isn't an option) and that being her patron usually entitles you to some added social time with her outside of the sessions you've agreed to. As for the cost, there will be a premium on top of her usual fee, but sometimes it ends up being less drastic than you might expect. Most ladies who do tours enjoy the travel itself at least a little, so unless she is *completely* uninterested in spending time in your city but for the fact you've sponsored her, once you cover her expenses you're likely to get some appreciable break on her rate. Folks should also consider that there are several 'benign' reasons why someone simply may not be allowed to enter a lady's home country, so her visiting would be the answer in that case.