sooo. Nice shield drop 
it is rare to have max stats on a low req item - even more so with max damage/armor for the req. The combination isn't the ultimate best, but charr with a dmg reduction ain't too bad. So the shield would value in the lower two digit ecro range.
The lowest req possible on gold items is 3. It is however significantly rarer than a q4 - since it can only drop from lvl 12 mobs - and a) the lower the level the lower the gold item drop rate and b) the value range for this is much thinner than for q4, meaning it will drop fr less frequent from lvl 12s than a q4. That is reason why q3 gold max dualmod items are almost unheard of - but possible.
The swords you are asking for are possible drops for sure, the market on these is very thin however. You can get one for 10e or you might have to pay 10a - it entirely depends on how many fall in love and fight you for it. Personally I'd consider something in the 100-200e range fair - the 15^50 version on the lower end, the caster on the upper (since a 15^50 would make sense to deal damage which is in conflict with the low damage)
The last one: a charrslay mod for sword 20% is usually sold in the 1-10e range... it is useable for nolani farming and thus 5-7e seems a fair price.
Hope it helps
and if the first statement is true, you will have fewer drops per run resulting in even more runs to get the same data sample. And you'd need to make sure you are on the same level of factor 1 in order to compare runs for factor 2.
