Then get the netbook and use it for what it's for - browse the web.
"Using the web" increasingly involves watching videos / movies, listening to music or playing online games. It is not unreasonable for a potential customer to ask for the option to connect a netbook to a large screen, be it for a business / school presentation or strictly for entertainment purposes.
HDMI on a netbook is one of the wierdest ideas I've heard in a long time.
HDMI on a netbook is becomming fairly common now.
No business projectors use HDMI - they all use VGA.
That is a bold statement to make. I am afraid it is not true.
Here are just two random examples out of many: