I personally think that if we could use carrots or cc to buy a certain item for example say a new scroll came out and it costs 1050rc or you could buy it with 50-100k. Nimonix can change it up a little if they want
You can do that for some items. That being said RF may be a F2P game but the main goal is to make money.
In theory this might work but like savage said this company is all about money if they make items multiple currency's then we'd pay for it in some way with either more expensive items overall or having a huge portion of item cost more