Just because Robinson stop PRODUCING (i.e. making new) R22s does not mean they disappear from the Earth.
The 2200hr rebuild means there are lots of existing machines being recycled back to 'new' especially in the high hours training environment.
Even given 'training attrition' (student write offs) there will still be a lot in circulation.
Plus more people training on stripped down R44s (7 hole panel, one radio, etc) which gives a better link to more product sales to PPLs for Robinson.
Commercially b'williant,
h-r