Bitcoin: block reward for a tiny transaction I'm sure this a basic question, but I would like to check my understanding. 

At the moment, a miner who grows the blockchain by confirming a block is rewarded with 12.5 bitcoins. This incentivises miners to validate transactions. 

Today each bitcoin is worth $13032.00.

It is really correct that if Bob sends Alice some tiny fraction, say one ten-thousandth, of a bitcoin, today worth $1.30, then each confirmation is worth $162,900.00 to the miner?

If this is correct, then it is only economical to offer a transaction fee comparable in value to the miner's reward when the transaction is huge. So as a follow up, I would like to ask:

What are typical transaction fees at the moment, and how is this likely to change as the number of bitcoins approaches its theoretical maximum of 21 million?
The reward is for a block, and a typical block generally contains around 2,500 separate transactions in it.

Typical transaction fees seem to be around $8 (USD), so transaction fees in a block are typically around $20,000.

The miner who successfully submits a block receives:

   $162,500 (12.5 BTC * $13,000) : reward
 +  $20,000 (2,500 tx * $8 ea.)  : tx fees
--------------------------------
   $182,500 (approximately)