Transferring Infamy/influence
It's been a while since I've looked up any info on influence <-> infamy trades, but if I recall correctly...
1) Influence -> Infamy: Most traders charge a 10% fee on the trade. For every 1 million infamy you desire, you have to give them 1.1 million influence.
2) Infamy -> Influence: Since there's more inf running around on the Hero side of things, most traders are willing to give a straight 1:1 trade.
Of course, this completely depends on who offers to make the trade and what they feel is an appropriate fee, if any. Some people view this as a way to put a little extra change in their pockets; while I don't agree with it myself, I certainly don't fault them for wanting compensation for their time.
Your best bet is to, as previously mentioned, arrange the trade in the Market forum. Marketeers may be shrewd, but I've never seen one actually go back on an agreement.
You could also contact someone via your server's global channel, though you have less guarantee that it's not somebody just out to steal your inf.
Main Hero: Chad Gulzow-Man (Victory) 50, 1396 Badges
Main Villain: Evil Gulzow-Man (Victory) 50, 1193 Badges
Mission Architect arcs: Doctor Brainstorm's An Experiment Gone Awry, Arc ID 2093
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Bear in mind that not all the markups are intended to create a profit. Sometimes they're meant to counteract server transfer fees that the transfer provider has to incur to move the money from server to server. Markups on infamy <-> influence exchanges also may have exchange rates based on the perceived relative value of the currencies. (So if most stuff on the BM costs more than on WW, then expect to get less than 1 infamy per 1 influence.) If people providing money transfer/exchange services don't take these factors into account when moving the inf around then they actually lose purchasing power in the process.
Blue
American Steele: 50 BS/Inv
Nightfall: 50 DDD
Sable Slayer: 50 DM/Rgn
Fortune's Shadow: 50 Dark/Psi
WinterStrike: 47 Ice/Dev
Quantum Well: 43 Inv/EM
Twilit Destiny: 43 MA/DA
Red
Shadowslip: 50 DDC
Final Rest: 50 MA/Rgn
Abyssal Frost: 50 Ice/Dark
Golden Ember: 50 SM/FA
A younger son of a friend of mine, who is on a football team at his school, has picked up using "Verse" (a short form of verses) as a verb. As in "We verse the Wildcats this Saturday." It reminded me of when Bucky cat uses "food" as a verb in the Get Fuzzy comic strip. Seeing a monkey he say's, "I can food that." I love it.
Le Blanc 50 Dark/Dark Scrap
High Huntress 50 Archery/NRG Blast
And a goatload of others. On a goatload of servers.
Official Rickroller of Hero Con 1

Blue
American Steele: 50 BS/Inv
Nightfall: 50 DDD
Sable Slayer: 50 DM/Rgn
Fortune's Shadow: 50 Dark/Psi
WinterStrike: 47 Ice/Dev
Quantum Well: 43 Inv/EM
Twilit Destiny: 43 MA/DA
Red
Shadowslip: 50 DDC
Final Rest: 50 MA/Rgn
Abyssal Frost: 50 Ice/Dark
Golden Ember: 50 SM/FA