Expensive inks - a good option?

In former days we used to buy inks frotm the pen manufacturer or popular inks expsecially from Pelikan or Parker. Prices raised in the popular ink ranges, too, but ... In the last years LE inks and special inks from Pelikan, Pilot or inks from Caran d´Ache or Faber-Castell with beautiful flacons became much more popular. On the other hand Diamine inks come in over 80 colours and are inexpensive. 

These are my personel experiences with inks:

• When you use standars inks such as royal blue, look for a good value ink. Pelikan Königsblau, Rohrer und Klinger Königsblau or Parker Blue Permanent. A more expensive Montblanc Royal Blue is not the better value.
• Iroshizuko inks from Pilot come in some interesting blue colours and glide very smoothly across the paper. They are light to medium saturated and are pricey. Some colours are light and bright, too. If you have the chance to try one ... Some internet stores give you better prices from Japan stores (16-20 EUR incl. shipping). 
• Diamine inks com in 30 mL and 80 mL. The plastic containters are unexpensive (ca. 3.50 EUR) and a nice option to check inks. The 80 mL glass bottles are inexpensive, too (ca. 8 EUR). They are easy to buy in Europe (yes, and in Germany, too) and cover nearly every colour variants. They are medium to high saturated and non-waterresistant.
• Light and natural inks come from J. Herbin in France. Ink flow is different from poor to really nice. No special conservation is used (mold!). Higher prices and very special inks.
• Colored and vivid inks come from Diamine, Herbin or Pelikan Edelstein or are LE inks. 
• Using waterresistant and document inks ins behaviour is more important than ink colour itsself. Security, feathering, bleeding-through and ink flow are very important. Please consider dry flow of iron gall inks and feathering of modern pigment inks. Modern inks also can show coloration of pen barrels, sinks or clothes. Frequent cleaning is absolutely necessary and drying out is worst case. 
• Vintage pens run perfectly with standard inks including iron gall inks. I prefer royal blue ink exspecially for rubber sack pens such as Sheaffer PFM or lever filler pens. Using iron gall inks please ensure to use such pens every day to avoid clotting. 
• Dark blue or blue-black inks are very fascinating and are far away from typical school inks. For correspondence they are perfect when you don´t want to use black. Medium saturated inks as Montblanc Midnight Blue ("non perma") or high saturated inks from Diamine, Sailor or de Atramentis can be a good thing. 
• Green inks come in very different types from light green, olive, forrest green to the green-browns.
• LE inks? Montblanc offers wonderful LE inks in 35 mL bottles, pricey and for a small period of time only. Herbin kept its 1670 anniversary inks Rouge Hematite and Blue Océan in production and Pelikan Edelstein Inks of the Year are produced in the special year. 
• Premium flacons may be beautiful but not necessarily useful. Small openings, short filling levels and missing filling reservoirs often lead to dirty fingers. 

If you have any question or want to give a commend please don´t be shy and use the comment function. I hope this information was useful. Bye-bye.