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fact #1
it is always easier to pump a coin that has a lower price than to pump a coin with higher price.
XRP is worth <10k satoshi while ETH is worth 2.9 million satoshi.
the dump of a coin with higher price is also more severe than a dump of a coin with lower price.
I think that indeed it is easier to pump XRP than ETH right now, but not because of what you said. The price of one coin is irrelevant in this regard. What really matters is the daily trading volume, the higher it is for a coin the harder to pump it. Current daily trading volume for XRP is 291,948 BTC, while it is 677,074 BTC for ETH, and that's why XRP is easier to pump. For example, if you spent 30,000 BTC on buying XRP the impact on its price would be more significant than that would be on ETH price if you spent the same amount on buying ETH.
fact #2
market cap is price * supply
XRP has 40 billion useless tokens in circulation while ETH has 103 million useless token in circulation so XRP should have a bigger market cap! and that is one of the main reasons why it is meaningless.
Yes, Market Cap = Price X Circulating Supply, but it's not that you can create 1 billion, say, SHT coins, sell 1,000 SHT to yourself for $1 each on a small exchange and then your SHT coin automatically gets $1 billion Market Cap. If it was that easy we would have hundreds of coins with over $1 billion Market Cap, and yet we have only 10 of such coins at the moment.
And that is so because:
1. It is not that easy to be listed on CoinMarketCap;
2.
Cryptocurrency Rank is determined by market capitalization but penalizes cryptocurrencies with low 24h trading volume
Source:
https://coinmarketcap.com/methodology/