The guy that taught me to ride was an ex track racer, he said that alot of the cheaper basic models is what the track racers use as only those with big sponsers could afford to keep messing up the really expensive lids.
He pretty much said that if you expect to go down alot as a beginner or if thats the conditions your riding in buy cheap and replace when compromised, it makes more sense than using an expensive lid and not replacing when you think its taken a hit. He also added his own lid was expensive because he liked to look like a fighter pilot/stormtrooper not because it offered better protection.

Hi my 10p worth here is the Helmet Test done by uk gov. SHARP - The Helmet Safety Scheme I pers go for what I find comfey first then the price is tthe second factor.
M & P have some helmets £100 with internal bluethooth