£200 to £400 is and isnt big money for a painting....
My dad was an aviation and shipping artist till he lost his sight some years ago.
We looked at some oils in Old Warden Aerodrome 30 years ago...they were £300 then, and to be honest, were crud.
He sold his paintings at quite affordable prices, usually on commission by ex servicemen. He reckoned he'd rather enjoy painting and selling regularly (spread the love, so's to speak)..than sitting and waiting for someone to buy the same pictures at 4 times the price.
Sell expensive at small volume, or affordable at a rate he could keep busy.
He would do a 3 ft by 2 ft oil painting of a sailing ship for instance...for maybe £100 , 10 years ago. If i say so myself...the detail and investigation that went into the art was very thorough.
The upshot is, i have a small collection of very nice oils and watercolours....and never paid a penny