The starting price here is genuinely low. You can get 1 GB for 1 day for $0.76, which is enough to check maps, send messages, and look up a cafe in Vilnius for a single busy day. If you want that same 1 GB to last a week, the 1 GB for 7 days plan is $0.8. That tiny price gap is the first thing to notice. Stretching your data over more days costs almost nothing extra.
Step up a little and the value gets better. The 3 GB for 15 days plan is $2.1, and the 3 GB for 30 days plan is $2.24. For most short trips, three gigabytes spread across a couple of weeks is plenty for daily use. You are paying a few cents more for double the calendar time, so longer validity is usually the smarter buy.