How do you figure its $20K-$30K? Corn flakes type course is $11K + 6 or 8 weeks leave. Then you have to do an OJT if it was first type. Even JTP course that have been around ling before Part 66. Most people in aviation have paid for at least one course in their working life except maybe for some chosen few at the rat.
Pre-vocational course $5000
Part 66 Theory exam package from Aviation Australia $5000 (self study)
RPL from Aviation Australia $2000
'Cornflakes packet course' (your words) $11000
Interstate travel unless you live in Brisbane $whatever
2 years worth of annual leave $priceless
In other words, big money from people who don't earn big money to move forward in a declining industry. Only to be overlooked by someone from the 3rd world who will do you job for 1/2 the price with all the licences under the sun.