TV get cheaper with time , especially when they renew the model every year.
C8 is still relatively new in Malaysia , I was checking my unit's production date it was just manufactured in May 2018 from Indonesia.
So I don't expect the model getting much cheaper anytime soon .
If you don't play much games , C7 / C6  are much cheaper and still a great choice to go . I remember Desa Home was selling 65 inches C6 for RM9000

OLED TV has self emitting LED , the contrast is so deep it is virtually infinite  . They are also pretty versatile so you generally don't have to worry about glare  , even in lit room OLED TV will still look great . All Oled TV also come with a glossy finish that is effective at overcoming glare and reflection . The sunlight will cause the strongest kind of glare , no doubt  . Even for the brightest LED TV like Q9FN , the picture will degrade under such condition , but rest assured you will still be getting the best picture compare to other models .
As for the burn in issues , it is mostly cause by the uneven aging of the OLED organic pixels.  Burn in issues on OLED are rare and extreme cases ,as long as you maintain a healthy viewing habits .  But these occurrence are overblown because people only complain when they encounter problems

Should you vary the content you watch / games you play, the risk should be kept to a minimal.
Pixel refresher system exist in all the OLED TV , including Sony's but they are called different name . They are meant to help clearing the image retention , which is a completely different issue. Currently there's no direction solution to burn in
Desa home was selling several OLED last time I checked ,  the 65 inches E7 is priced at 10999 and 65 inches C6 at 8999 . Aside from the addition of a few new features  , the picture quality will remain largely the same on these panels for general uses
C8 (and the other 8 series ) remains the brightest OLED  , but the improvement is marginal . But all OLED are more than bright enough to match the highest HDR standard thanks to the perfect black level

I suggest you get a C8 , since you are a gamer . Dynamic tonemapping in game mode on C8 make your HDR games look better.
If you watch more movies than playing games , then go for a C7 instead.
10k is a good price for a 65 inches 3 months old OLED c7, Desa home is still selling the same model for 12k++
Make sure to check for signs of burn in or image retention if you end up buying .