Is it worth it to buy champions right now?

The season is almost over and the new one brings the fusion of IP and blue essence (BE). All the IP we have will become BE and our BE will be multiplied up to the value of IP.

Is it worth it to buy champions right now or should we wait until after the fusion to buy them?

Example

I want to buy Nami, who costs 6300IP. She will cost 6300BE next season. But with the fusion IP-BE can I save some IP if I buy her now?

Solution 1:

Everything in the store will cost the same as before

The changes can be seen as IP being renamed to BE, and current blue essence being merged into it at an increased rate (x6.5)

The overall IP price of champions will remain the same

So, what about the blue essence currently in your inventory? When preseason hits, we’ll scale it up proportionally (multiplying it by about 6.5 times) when calculating your new BE account balance. So if you already have 975 BE in loot, we’ll convert it into 6300 BE when preseason hits. (source)

Do note that you may be able to gamble your IP to try to get more BE after the merge, by buying champion shards

Solution 2:

IP will simply be renamed to Blue Essence. All costs remain the same. All IP/BE items will be bought using BE.

The only difference is that your current Blue Essence will receive a small multiplication at the End of the Season (x6.5). This is also why it's currently worth buying Champion Shards, disenchanting and turning them into Blue Essence, which wields an ~8% net profit

On a purely economic standpoint, it's not worth buying Champions, it's better to invest all of your IP on Champion Shards, thus allowing yourself for an 8% increase to your IP (which will be called Blue Essence in Season 8)