With that sort of tool, it sounds nice but you have to consider how much the tool costs, how many times you use it, how long it will last, etc. One thing that the job taught me was how to wisely allocate money towards a business and not buy stuff like this that you don't need.

As long as the client was happy and we were complying with regulation, we used the cheapest tools possible. You could spend spend 1000 or whatever it costs on this thing that vacuumes up paint and put the job in the red or you could spend 10 bucks on some paint scrapers and get shit done in the same amount of time. These kinds of tools also don't always work or take a lot of overhead to set up which is lost money in wages as well as time on the job that could be spend painting the house. The difference between 50% profit and a loss is surprisingly thin.

For a house with a huge amount of lead paint this kind of tool might be useful but that job would be quoted differently and likely would go to a specialist that charges more accordingly and maybe even contracts someone else to do the actual painting. These days most houses that need it have been done.