I have patiently explained about five times on this thread exactly what the problem with ash ingestion is :- extremely costly damage to engines.
It appears that there are some people who are too selfish or stupid to understand that exposure to ash risks ongoing engine maintenance problems that will make the dislocations caused by occasional airspace closures pale into insignificance.
The only answer I can think of for these people is to buy your own aircraft if you wish to accept the risk of flying through ash clouds.