A level ten player facing a level twelve player starts the match at a massive mathematical disadvantage before a single card is even played.

Many players inadvertently stall their base progression by hoarding resources or ignoring the social systems of the game.
The Primary Source: Upgrading Cards
However, the ratio of gold spent to experience gained changes drastically depending on the level of the upgrade.

Upgrading a card from level one to level two costs virtually nothing and provides a very high amount of XP per gold coin spent.
Never compromise your primary win condition just for base XP.The cost is microscopic, but the XP bump is significant.Balance is required. The Secondary Source: Clan Donations
The second most consistent way to generate base experience is by actively donating cards to your clanmates.

You are essentially converting cards you will never use into base hitpoints and currency.
Donation TypeExperience GainedBasic TroopsConsistent, reliable progressionRare and Epic CardsLarge burst of XP, but highly limited in how many you can give The Impact of King Levels
If your king tower was one level higher, it would possess several hundred more hitpoints, turning that loss into a win.

A higher level tower might kill a goblin in two shots instead of three, preventing thousands of points of chip damage over a match.

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