As others have said, you're looking a it solely from the punter's perspective. Yes, most of us would agree that drinks, a good meal and a swanky hotel come at a price and as such the WG's fee on top seems a hefty surcharge.
But it's not.
Don't forget a good majority of WGs spend at least 50% of their working lives in hotels. Probably a good 30%-40% spend ALL their working lives touring via different hotels in different cities.
Moreover, fluffy punters buy them myriad shit constantly. I've seen tables stacked high with more gifts than a Christmas morning at a Barnado's childrens home. Punters seem to buy anything and everything from the ubiquitous flowers and chocolates to teddy bears, lingerie and shoes to bizarrely extravagant items such as jewellery, iphones, ipads, laptops and even .. shock horror .. clean bed sheets!
Point being: for most WGs, all the 'extras' are actually nothing of the kind as they are used to being showered with tat by over-enthusiastic punters who foolishly believe they're buying either a 'better' service or (even more naively) a chance at taking things into 'real life'.
Sadly, it's those kind of punters who don't realise they're doing themselves a disservice by revealing their fluffiness before the WG has even taken her kit off.
For the record: the most I have ever taken to any punt is a bottle of wine.