To put another slant on this, ive had a small part time business supplying parts, etchings etc for around 17 years ( not railway) I used to have a website and did a fair amount of advertising. Quite franklt it was a pain in the backside
I spent more time dealing with enquiries ( more often than not ridiculous purile ones) than i did actually dealing with business and orders. I shut the lot down. Now i have a client base that keep me busy enough and i dont have to deal with time wasters. So, the internet can be a two edged sword.