In my opinion, farming elu and ori isnt hard at all, i dont think elu and ori should be messed with, the price is fine, because it also allows newbies to get money by selling elu/ori.
Without elu/ori to balance it out, a complete new player wouldn't be able to make money unless they get some super rare cards or loots.
How would a new player make money if elu/ori price goes down or purchasable from NPC?
There are a ton other items which are mob specific which still sell quite regularly for a high rate. Quest items for hats, for example. Fins seem to sell for about 75k-100k, each. Stems, which are very easy to get drops sell for 5-10k. Items used for Converters sell for about 10k each, which drop from super low level monsters, it's just most veteran players can't be bothered to farm it.
The list goes on. Elu and Ori aren't the only things people sell for a profit these days, it's just the one that gets abused with prices. I mean, the price of those literally doubled the week Dress Hat came out.
How are new players suppose to upgrade weapons and armor in such a market? When it comes down to it, new players will never use an elu or ori they find to upgrade their gear, instead opting to sell it instead, to all the rich players with their +7 - +9 gears, leaving them stuck in low level areas scraping the low xp mobs they can, trying to get to the high xp areas by level alone.
At least if they can buy Ori from the vendor, they can try to get their NPC sold weapons to do a bit more damage, or spend a few thousand zeny at a time to slowly upgrade their armors to reduce damage, so they can move up to the higher level areas faster.
Normal Elu and Ori already have a somewhat low percentage to upgrade passed the safe point. Having a permanent SV conversion for Elu/Ori (with a chance of failure) would still sell Silvervine, so Warpportal still gets their cash shop going. Veteran players can still buy Elu/Ori from new players (assuming they sell below NPC costs) so if the new player opts to try to get money over upgrades, that's still an option.