probably an easy routing question, so please help

I'm not routing master, so this might be obvious, but I've been
curious about the answer to this question. Say an individual was
issued two IP blocks from their ISP.

IP Block 1 : 123.123.123.0 /28
IP Block 2 : 123.123.123.128 /28

If the individual doesn't really care to separate the two networks for
any reason and was just unfortunately issued two /28 blocks instead of
one /27 block, isn't the link between the two networks going to suffer
unnecessarily? For instance, if Server A located in Block 1 is
plugged into the same gigabit switch as Server B in Block 2 and they
want to initiate a file transfer, they are required to run out to the
default gateway (ISPs router) through a T1 (perhaps) connection and
back in when it would have been much faster for them to go directly to
the other's gigabit ethernet port on the switch? If this is the case,
would this be remedied, albeit poorly, by just subnetting both of
these ranges together into one giant class C address range? (I
understand fully that they wouldn't be able to access the rightful
owners of the rest of the IP addresses in that range as they would
search on their local LAN for them and time out, but this is a
hypothetical situation and only serves to educate myself on the
concept.) That said, how SHOULD this be handled in order to keep the
connection between the subnets optimal?

I'm quite sure that I'm missing some key concepts here, so please be
kind and explain them to me.

Thanks.

pk

.

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