TBH I don't see the increase a problem. I love my basketball and I have had good (not excellent) seats for a long time. Even when the team was crap and Marty was the worse coach we ever had, I still renewed each year. We have had 2 really exciting seasons, the demand for tickets has increased.
However to get new business, you need good seats to attract people who can afford to sit in them. Sorry long time Sixers fans (including myself), but your loyalty in attendance has not kept up with the market cost, therefore I have a few suggestions.
If your great seat is too expensive, you need to swap to a good seat. If good is out of your range, you could try nearly good. The demand for good money from the venue in order to support the level of competition requires the Sixers to get with the time.
For us fans that travelled to Melb and sat in crap seats for more than what we can sit in platinum for, we understand how lucky we have been.
In case you are wondering, tickets for 2018/19 paid for.