It is not disgraceful putting medals on sale on eBay (IMHO) but is actually following historical precedent.
Many who were awarded medals in WW2 did not bother to claim them. Others put them in a drawer and forgot them. Many more gave them to their children to play with.
Only in the 70s, as they approached retirement, did they recall their war service with pride and nostalgia. Many had to buy their medals on the open market or buy replicas.
Whilst selling medals on eBay has a precedent I would suggest better to 'sling them in a drawer' and bring them out in future years to remind future generations and to honour those who died both now and subsequently.