Totally. I see it in my own industry (minesite automation) - the client wants some parts, we order the parts, add our markup, and bill the client. The more expensive the parts, the more money in my pocket. (I still do the right thing and try to get them the best price, but I can see the temptation.)

Out of curiosity, if the client knows which parts they want, why aren't they ordering the parts themselves?